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Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts
    
Balance at beginning of year $ 140,000 $ 135,000
Additions Charged to Expenses 17,358 10,806
Deductions 7,358 5,806
Balance at end of year 150,000 140,000
Inventory Valuation Reserve
    
Balance at beginning of year 549,000 516,600
Additions Charged to Expenses 186,141 221,113
Deductions 185,141 188,713
Balance at end of year $ 550,000 $ 549,000